﻿<!DOCTYPE html>
<html>
<head>
  <title>Table Layout</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="TypeScript: Use the TableLayout extension to arrange nodes in a tabular or grid-like form." />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
  <div id="sample">
    <div style="width: 100%; display: flex; justify-content: space-between">
      <div id="myPaletteDiv" style="width: 120px; height: 600px; margin-right: 2px; border: solid 1px black"></div>
      <div id="myDiagramDiv" style="flex-grow: 1; height: 600px; border: solid 1px black"></div>
    </div>
    <p>
      This sample demonstrates a custom Layout, TableLayout, that is very much like a simplified "Table" Panel layout, but working
      on non-Link Parts in a Diagram or a Group rather than on GraphObjects in a Panel. The layout is defined in its own
      file, as <a href="TableLayout.ts">TableLayout.ts</a>.
    </p>
    <p>
      You can drag-and-drop nodes from the Palette into any Group. Dragging into a Group highlights the Group. Drops must occur
      inside Groups; otherwise the action is cancelled.
    </p>
    <p>
      Each row and each column is <a>Part.resizable</a> and has a custom <a>Part.resizeAdornmentTemplate</a> showing a single
      resize handle on the right side or on the bottom. There is a custom LaneResizingTool to provide a minimum width or
      height based on the contents of all of the groups (cells) in that column or row.
    </p>
    <p>
      This example assumes the Groups are predefined and exist in each cell at a particular row/column, but this sample could be
      extended to allow adding and removing rows and/or columns.
    </p>
  </div>

  <script type="module" id="code">
    import * as go from "../release/go-module.js";
    import { TableLayout } from './TableLayout.js';

    if (window.goSamples) goSamples(); // init for the samples -- you don't need to call this
    const $ = go.GraphObject.make; // for conciseness in defining templates

    // define a custom ResizingTool to limit how far one can shrink a row or column
    class LaneResizingTool extends go.ResizingTool {
      computeMinSize() {
        const diagram = this.diagram;
        if (this.adornedObject === null)
          return new go.Size();
        const lane = this.adornedObject.part; // might be row or column
        if (lane === null)
          return new go.Size();
        const horiz = (lane.category === 'Column Header'); // or "Row Header"
        const margin = diagram.nodeTemplate.margin;
        let bounds = new go.Rect();
        diagram.findTopLevelGroups().each((g) => {
          if (lane === null)
            return;
          if (horiz ? (g.column === lane.column) : (g.row === lane.row)) {
            const b = diagram.computePartsBounds(g.memberParts);
            if (b.isEmpty())
              return; // nothing in there?  ignore it
            b.unionPoint(g.location); // keep any empty space on the left and top
            b.addMargin(margin); // assume the same node margin applies to all nodes
            if (bounds.isEmpty()) {
              bounds = b;
            }
            else {
              bounds.unionRect(b);
            }
          }
        });
        // limit the result by the standard value of computeMinSize
        const msz = super.computeMinSize();
        if (bounds.isEmpty())
          return msz;
        return new go.Size(Math.max(msz.width, bounds.width), Math.max(msz.height, bounds.height));
      }
      resize(newr) {
        const diagram = this.diagram;
        if (this.adornedObject === null)
          return;
        const lane = this.adornedObject.part;
        if (lane === null)
          return;
        const horiz = (lane.category === 'Column Header');
        const lay = diagram.layout; // the TableLayout
        if (horiz) {
          const col = lane.column;
          const coldef = lay.getColumnDefinition(col);
          coldef.width = newr.width;
        }
        else {
          const row = lane.row;
          const rowdef = lay.getRowDefinition(row);
          rowdef.height = newr.height;
        }
        lay.invalidateLayout();
      }
    }

    const myDiagram = $(go.Diagram, 'myDiagramDiv', {
      layout: $(TableLayout, $(go.RowColumnDefinition, { row: 1, height: 22 }), // fixed size column headers
        $(go.RowColumnDefinition, { column: 1, width: 22 }) // fixed size row headers
      ),
      'SelectionMoved': (e) => { e.diagram.layoutDiagram(true); },
      'resizingTool': new LaneResizingTool(),
      // feedback that dropping in the background is not allowed
      mouseDragOver: (e) => { e.diagram.currentCursor = 'not-allowed'; },
      // when dropped in the background, not on a Node or a Group, cancel the drop
      mouseDrop: (e) => { e.diagram.currentTool.doCancel(); },
      'animationManager.isInitial': false,
      'undoManager.isEnabled': true
    });

    myDiagram.nodeTemplateMap.add('Header', // an overall table header, at the top
      $(go.Part, 'Auto', {
        row: 0, column: 1, columnSpan: 9999,
        stretch: go.GraphObject.Horizontal,
        selectable: false, pickable: false
      }, $(go.Shape, { fill: 'transparent', strokeWidth: 0 }), $(go.TextBlock, { alignment: go.Spot.Center, font: 'bold 12pt sans-serif' }, new go.Binding('text'))));

    myDiagram.nodeTemplateMap.add('Sider', // an overall table header, on the left side
      $(go.Part, 'Auto', {
        row: 1, rowSpan: 9999, column: 0,
        stretch: go.GraphObject.Vertical,
        selectable: false, pickable: false
      }, $(go.Shape, { fill: 'transparent', strokeWidth: 0 }), $(go.TextBlock, { alignment: go.Spot.Center, font: 'bold 12pt sans-serif', angle: 270 }, new go.Binding('text'))));

    myDiagram.nodeTemplateMap.add('Column Header', // for each column header
      $(go.Part, 'Spot', {
        row: 1, rowSpan: 9999, column: 2,
        minSize: new go.Size(100, NaN),
        stretch: go.GraphObject.Fill,
        movable: false,
        resizable: true,
        resizeAdornmentTemplate: $(go.Adornment, 'Spot', $(go.Placeholder), $(go.Shape, // for changing the length of a lane
          {
            alignment: go.Spot.Right,
            desiredSize: new go.Size(7, 50),
            fill: 'lightblue', stroke: 'dodgerblue',
            cursor: 'col-resize'
          }))
      }, new go.Binding('column', 'col'), $(go.Shape, { fill: null }, new go.Binding('fill', 'color')), $(go.Panel, 'Auto', {
        alignment: go.Spot.Top, alignmentFocus: go.Spot.Bottom,
        stretch: go.GraphObject.Horizontal,
        height: myDiagram.layout.getRowDefinition(1).height
      }, $(go.Shape, { fill: 'transparent', strokeWidth: 0 }), $(go.TextBlock, {
        font: 'bold 10pt sans-serif', isMultiline: false,
        wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
      }, new go.Binding('text')))));

    myDiagram.nodeTemplateMap.add('Row Sider', // for each row header
      $(go.Part, 'Spot', {
        row: 2, column: 1, columnSpan: 9999,
        minSize: new go.Size(NaN, 100),
        stretch: go.GraphObject.Fill,
        movable: false,
        resizable: true,
        resizeAdornmentTemplate: $(go.Adornment, 'Spot', $(go.Placeholder), $(go.Shape, // for changing the breadth of a lane
          {
            alignment: go.Spot.Bottom,
            desiredSize: new go.Size(50, 7),
            fill: 'lightblue', stroke: 'dodgerblue',
            cursor: 'row-resize'
          }))
      }, new go.Binding('row'), $(go.Shape, { fill: null }, new go.Binding('fill', 'color')), $(go.Panel, 'Auto', {
        alignment: go.Spot.Left, alignmentFocus: go.Spot.Right,
        stretch: go.GraphObject.Vertical, angle: 270,
        height: myDiagram.layout.getColumnDefinition(1).width
      }, $(go.Shape, { fill: 'transparent', strokeWidth: 0 }), $(go.TextBlock, {
        font: 'bold 10pt sans-serif', isMultiline: false,
        wrap: go.TextBlock.None, overflow: go.TextBlock.OverflowEllipsis
      }, new go.Binding('text')))));

    myDiagram.nodeTemplate = // for regular nodes within cells (groups); you'll want to extend this
      $(go.Node, 'Auto', { width: 100, height: 50, margin: 4 }, // assume uniform Margin, all around
        new go.Binding('row'), new go.Binding('column', 'col'), $(go.Shape, { fill: 'white' }, new go.Binding('fill', 'color')), $(go.TextBlock, new go.Binding('text', 'key')));

    myDiagram.groupTemplate = // for cells
      $(go.Group, 'Auto', {
        layerName: 'Background',
        stretch: go.GraphObject.Fill,
        selectable: false,
        computesBoundsAfterDrag: true,
        computesBoundsIncludingLocation: true,
        handlesDragDropForMembers: true,
        mouseDragEnter: (e, group) => {
          if (group instanceof go.Group) group.isHighlighted = true;
        },
        mouseDragLeave: (e, group) => {
          if (group instanceof go.Group) group.isHighlighted = false;
        },
        mouseDrop: (e, group) => {
          if (!(group instanceof go.Group)) return;
          // if any dropped part wasn't already a member of this group, we'll want to let the group's row
          // column allow themselves to be resized automatically, in case the row height or column width
          // had been set manually by the LaneResizingTool
          const anynew = e.diagram.selection.any((p) => p.containingGroup !== group);
          // Don't allow headers/siders to be dropped
          const anyHeadersSiders = e.diagram.selection.any((p) => {
            return p.category === 'Column Header' || p.category === 'Row Sider';
          });
          if (!anyHeadersSiders && group.addMembers(e.diagram.selection, true)) {
            if (anynew) {
              e.diagram.layout.getRowDefinition(group.row).height = NaN;
              e.diagram.layout.getColumnDefinition(group.column).width = NaN;
            }
          }
          else { // failure upon trying to add parts to this group
            e.diagram.currentTool.doCancel();
          }
        }
      }, new go.Binding('row'), new go.Binding('column', 'col'),
        // the group is normally unseen -- it is completely transparent except when given a color or when highlighted
        $(go.Shape, {
          fill: 'transparent', stroke: 'transparent',
          strokeWidth: myDiagram.nodeTemplate.margin.left,
          stretch: go.GraphObject.Fill
        }, new go.Binding('fill', 'color'), new go.Binding('stroke', 'isHighlighted', (h) => h ? 'red' : 'transparent').ofObject()), $(go.Placeholder, {
          alignment: ((m) => new go.Spot(0, 0, m.top, m.left))(myDiagram.nodeTemplate.margin),
          padding: ((m) => new go.Margin(0, m.right, m.bottom, 0))(myDiagram.nodeTemplate.margin)
        }));

    myDiagram.model = new go.GraphLinksModel([
      // headers
      { key: 'Header', text: 'Vacation Procedures', category: 'Header' },
      { key: 'Sider', text: 'Personnel', category: 'Sider' },
      // column and row headers
      { key: 'Request', text: 'Request', col: 2, category: 'Column Header' },
      { key: 'Approval', text: 'Approval', col: 3, category: 'Column Header' },
      { key: 'Employee', text: 'Employee', row: 2, category: 'Row Sider' },
      { key: 'Manager', text: 'Manager', row: 3, category: 'Row Sider' },
      { key: 'Administrator', text: 'Administrator', row: 4, category: 'Row Sider' },
      // cells, each a group assigned to a row and column
      { key: 'EmpReq', row: 2, col: 2, isGroup: true, color: 'lightyellow' },
      { key: 'EmpApp', row: 2, col: 3, isGroup: true, color: 'lightgreen' },
      { key: 'ManReq', row: 3, col: 2, isGroup: true, color: 'lightgreen' },
      { key: 'ManApp', row: 3, col: 3, isGroup: true, color: 'lightyellow' },
      { key: 'AdmReq', row: 4, col: 2, isGroup: true, color: 'lightyellow' },
      { key: 'AdmApp', row: 4, col: 3, isGroup: true, color: 'lightgreen' },
      // nodes, each assigned to a group/cell
      { key: 'Delta', color: 'orange', size: '100 100', group: 'EmpReq' },
      { key: 'Epsilon', color: 'coral', size: '100 50', group: 'EmpReq' },
      { key: 'Zeta', color: 'tomato', size: '50 70', group: 'ManReq' },
      { key: 'Eta', color: 'coral', size: '50 50', group: 'ManApp' },
      { key: 'Theta', color: 'tomato', size: '100 50', group: 'AdmApp' }
    ]);

    const myPalette = $(go.Palette, 'myPaletteDiv', {
      nodeTemplateMap: myDiagram.nodeTemplateMap,
      'model.nodeDataArray': [
        { key: 'Alpha', color: 'orange' },
        { key: 'Beta', color: 'tomato' },
        { key: 'Gamma', color: 'goldenrod' }
      ]
    });

    window.myDiagram = myDiagram; // Attach to the window for console debugging
  </script>
</body>
</html>